Have been using ubuntu mate for a few days now... seems to lock up or slow down at random. Using the mate desktop and firefox browser seems very laggy... few seconds between tabs... am sure my pi3 is quicker than this. Hope an update comes out soon.
UPDATE - just connected a USB key and it came on with one config under sudo fdisk -l, then a few minutes later it changed to dev/sda and i get this when i try and mount
Failed to mount '/dev/sda': Invalid argument
The device '/dev/sda' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?